package io.github.dunwu.javacore.jdk8.stream;

import java.util.Arrays;
import java.util.List;
import java.util.function.Supplier;
import java.util.stream.Stream;

/**
 * Testing the order of execution.
 *
 * @author Benjamin Winterberg
 */
public class Streams5 {

    public static void main(String[] args) {
        List<String> strings = Arrays.asList("d2", "a2", "b1", "b3", "c");

        // test1(strings);
        // test2(strings);
        // test3(strings);
        // test4(strings);
        // test5(strings);
        // test6(strings);
        // test7(strings);
        test8(strings);
    }

    private static void test8(List<String> stringCollection) {
        Supplier<Stream<String>> streamSupplier = () -> stringCollection.stream().filter(s -> s.startsWith("a"));

        streamSupplier.get().anyMatch(s -> true);
        streamSupplier.get().noneMatch(s -> true);
    }

    // stream has already been operated upon or closed
    private static void test7(List<String> stringCollection) {
        Stream<String> stream = stringCollection.stream().filter(s -> s.startsWith("a"));

        stream.anyMatch(s -> true);
        stream.noneMatch(s -> true);
    }

    // short-circuit
    private static void test6(List<String> stringCollection) {
        stringCollection.stream().map(s -> {
            System.out.println("map:      " + s);
            return s.toUpperCase();
        }).anyMatch(s -> {
            System.out.println("anyMatch: " + s);
            return s.startsWith("A");
        });
    }

    private static void test5(List<String> stringCollection) {
        stringCollection.stream().filter(s -> {
            System.out.println("filter:  " + s);
            return s.toLowerCase().startsWith("a");
        }).sorted((s1, s2) -> {
            System.out.printf("sort:    %s; %s\n", s1, s2);
            return s1.compareTo(s2);
        }).map(s -> {
            System.out.println("map:     " + s);
            return s.toUpperCase();
        }).forEach(s -> System.out.println("forEach: " + s));
    }

    // sorted = horizontal
    private static void test4(List<String> stringCollection) {
        stringCollection.stream().sorted((s1, s2) -> {
            System.out.printf("sort:    %s; %s\n", s1, s2);
            return s1.compareTo(s2);
        }).filter(s -> {
            System.out.println("filter:  " + s);
            return s.toLowerCase().startsWith("a");
        }).map(s -> {
            System.out.println("map:     " + s);
            return s.toUpperCase();
        }).forEach(s -> System.out.println("forEach: " + s));
    }

    private static void test3(List<String> stringCollection) {
        stringCollection.stream().filter(s -> {
            System.out.println("filter:  " + s);
            return s.startsWith("a");
        }).map(s -> {
            System.out.println("map:     " + s);
            return s.toUpperCase();
        }).forEach(s -> System.out.println("forEach: " + s));
    }

    private static void test2(List<String> stringCollection) {
        stringCollection.stream().map(s -> {
            System.out.println("map:     " + s);
            return s.toUpperCase();
        }).filter(s -> {
            System.out.println("filter:  " + s);
            return s.startsWith("A");
        }).forEach(s -> System.out.println("forEach: " + s));
    }

    private static void test1(List<String> stringCollection) {
        stringCollection.stream().filter(s -> {
            System.out.println("filter:  " + s);
            return true;
        }).forEach(s -> System.out.println("forEach: " + s));
    }

}
